// <editor-fold defaultstate="collapsed" desc="GNU GPLv3 Header">
/*
 * File:   Watermarking.java
 *
 * Copyright (C) 2013 Robert Antoni Buj Gelonch <rbuj@uoc.edu>
 * Copyright (C) 2013 David Megias Jimenez <dmegias@uoc.edu>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
// </editor-fold>
package essaw4aadtembedder;

// <editor-fold defaultstate="collapsed" desc="imports">
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
// </editor-fold>

/**
 * example017.py
 *
 * @author Robert Antoni Buj Gelonch <rbuj@uoc.edu>
 * @version 2.0
 * @since 2013-08-16
 */
class Watermarking {

    byte[] aWatermark;

    /**
     *
     * @param _sWatermark
     * @since 2013-08-16
     */
    public Watermarking(String _sWatermark) throws UnsupportedEncodingException {
        byte[] _ascii = _sWatermark.getBytes("US-ASCII");
        aWatermark = new byte[(_ascii.length * 8) + 16];
        for (int i = 0; i < 16; i++) {
            aWatermark[i] = 0;
        }
        for (int i = 0; i < _ascii.length; i++) {
            byte aux = _ascii[i];
            for (int j = 0; j < 8; j++) {
                aWatermark[(i * 8) + j + 16] = (byte) ((aux & 0x01) << 6);
                aux >>= 1;
            }
        }
    }

    /**
     *
     * @param i
     * @return
     * @since 2013-08-16
     */
    public short getWatermark(int i) {
        return aWatermark[i];
    }

    /**
     *
     * @return
     * @since 2013-08-16
     */
    public int size() {
        return aWatermark.length;
    }

    @Override
    public String toString() {
        String result = "";
        for (int i = 0; i < aWatermark.length; i++) {
            result += aWatermark[i] + ",";
        }
        return result;
    }
}
